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高橋 遼; 針井 一哉*; 松尾 衛; 前川 禎通; 齊藤 英治
no journal, ,
Generation and utilization of spin currents are essential for the field of spintronics, dealing with spin-based transport in condensed matter systems. The key is angular-momentum conversion from/to spin degrees of freedom. Several forms of the angular momentum are utilized but there existed an angular-momentum carrier remaining to be used, namely macroscopic mechanical rotation. Especially, we focused on the vorticity, local rotation in fluid motion, and consequently we demonstrated that the fluid-mechanical motion enables us to generate spin currents, which is a novel spin-current generating method "Spin Hydrodynamic (SHD) Generation". Our experimental results and its consistency with theoretical predictions will be discussed in this presentation. Besides that, our recent experimental progress in this spin-hydrodynamic conversion phenomenon will be discussed.
緒方 裕大; 中堂 博之; 小野 正雄; 針井 一哉; 松尾 衛; 家田 淳一; 岡安 悟; 前川 禎通; 齊藤 英治
no journal, ,
The magnetomechanical factor g of Gd, Tb, and Dy metals were determined by measurements of the Barnett effect using homemade apparatus, which consists of fluxgate sensor, magnetic shield, and high speed rotar. We performed mechanical rotation experiments up to 1.5 kHz at room temperature. The emergent magnetic field (Barnett field) in sample caused by mechanical rotation linearly depends on the rotational frequency. The gfactor of Gd, Tb, and Dy samples were estimated to be 2.00
0.08, 1.530.17, and 1.150.32, respectively, from the slopes of the rotation dependence of the Barnett field. This study provides a new technique for determination of the g factor even under zero magnetic field.